For deer the .270 and 7MM mags are roughly equivalent. If you' re looking to bigger game and (now here' s the rub) you are going to trade the .270 for the new gun, I' d buy the 7MM for it' s ability to shoot the heavier bullets. If you' re not going to trade the .270, then I' d think the .300 mags would be better choices.

In other words it depends on whether you want to trade the .270.